Seasonal patterns of leaf water relations in four co-occurring forest tree species: Parameters from pressure-volume curves.

Leaf water relationships were studied in four widespread forest tree species (Ilex opaca Ait., Cornus florida L., Acer rubrum L.

In Situ Estimates of Variable Plant Resistance to Water Flux in Ilex opaca Ait.

Xylem pressure potentials and stomatal diffusion resistances were measured in the field in Ilex opaca Ait. during days which differed in temperature and vapor pressure deficit. Water flux into leaves was calculated by combining the field data with laboratory determinations of the relation between tissue water deficit and water potential.

Components of water potential estimated from xylem pressure measurements in five tree species.

Pressure volume curves were measured with a pressure bomb in leaves collected in the field from Ilex opaca, Acer rubrum, Liquidambar styraciflua, Liriodendron tulipifera and Cornus florida. Water potential components were calculated from the curves. The species differed in the relationships measured.